The water at the junction of two rivers in southwest China's Chongqing City is in sharp contrast, creating a scene that looks just like a two-flavor hot pot. The Yangtze River is in yellow and red, while the Jialing River is in green.

The most famous "two-colored river" phenomenon is the Meeting of Waters (Encontro das Águas) in Manaus, Brazil, where the "black" water of the Rio Negro meets the "sandy-colored" water of the Amazon River (known as the Solimões). Because of differences in temperature, speed, and water density, the two rivers flow side-by-side for about 6 kilometers without mixing, creating a stark visual line. Another spectacular example often visited in 2026 is the confluence of the Indus and Zanskar rivers in Ladakh, India; the Indus appears emerald green while the Zanskar is a muddy brown or blue depending on the season. In Europe, the Rhône and Arve rivers in Geneva, Switzerland, provide a similar spectacle where the blue Rhône meets the grey, silt-heavy Arve. These "natural boundaries" are caused by the unique geological origins of each river—for instance, the Rio Negro is rich in decomposed plant matter (tannins), while the Solimões carries heavy mountain sediment from the Andes, preventing them from blending immediately upon contact.